aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* RTP MPEG2TS depacketizer
* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "mpegts.h"
#include "rtpdec_formats.h"
struct PayloadContext {
struct MpegTSContext *ts;
int read_buf_index;
int read_buf_size;
uint8_t buf[RTP_MAX_PACKET_LENGTH];
};
static void mpegts_close_context(PayloadContext *data)
{
if (!data)
return;
if (data->ts)
avpriv_mpegts_parse_close(data->ts);
}
static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
PayloadContext *data)
{
data->ts = avpriv_mpegts_parse_open(ctx);
if (!data->ts)
return AVERROR(ENOMEM);
return 0;
}
static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data,
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
const uint8_t *buf, int len, uint16_t seq,
int flags)
{
int ret;
// We don't want to use the RTP timestamps at all. If the mpegts demuxer
// doesn't set any pts/dts, the generic rtpdec code shouldn't try to
// fill it in either, since the mpegts and RTP timestamps are in totally
// different ranges.
*timestamp = RTP_NOTS_VALUE;
if (!buf) {
if (data->read_buf_index >= data->read_buf_size)
return AVERROR(EAGAIN);
ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
data->read_buf_size - data->read_buf_index);
if (ret < 0)
return AVERROR(EAGAIN);
data->read_buf_index += ret;
if (data->read_buf_index < data->read_buf_size)
return 1;
else
return 0;
}
ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len);
/* The only error that can be returned from avpriv_mpegts_parse_packet
* is "no more data to return from the provided buffer", so return
* AVERROR(EAGAIN) for all errors */
if (ret < 0)
return AVERROR(EAGAIN);
if (ret < len) {
data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
memcpy(data->buf, buf + ret, data->read_buf_size);
data->read_buf_index = 0;
return 1;
}
return 0;
}
const RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
.codec_type = AVMEDIA_TYPE_DATA,
.priv_data_size = sizeof(PayloadContext),
.parse_packet = mpegts_handle_packet,
.init = mpegts_init,
.close = mpegts_close_context,
.static_payload_id = 33,
};
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